616081 has 4 divisors (see below), whose sum is σ = 617652. Its totient is φ = 614512.

The previous prime is 616079. The next prime is 616103. The reversal of 616081 is 180616.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 148225 + 467856 = 385^2 + 684^2 .

It is a cyclic number.

It is not a de Polignac number, because 616081 - 2¹ = 616079 is a prime.

It is a super-2 number, since 2×616081² = 759111597122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (154413).

2⁶¹⁶⁰⁸¹ is an apocalyptic number.

It is an amenable number.

616081 is a deficient number, since it is larger than the sum of its proper divisors (1571).

616081 is an equidigital number, since it uses as much as digits as its factorization.

616081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 616081 is about 784.9082748959. The cubic root of 616081 is about 85.0901465760.

Adding to 616081 its reverse (180616), we get a palindrome (796697).

It can be divided in two parts, 6160 and 81, that added together give a square (6241 = 79²).

The spelling of 616081 in words is "six hundred sixteen thousand, eighty-one".